may refer to:
Calico Jack (1683–1720), a pirate in 18th Century
Captain Jack (Hawaiian) (died 1831), Naihekukui, commander of Kamehameha's fleet and father of Kalama
Captain Jack (Native American) (c. 1837–1873), Kintpuash, leader of the Modoc tribe
John Wallace Crawford aka "Captain Jack" (1847–1917), American Civil War veteran & Old West scout, poet of western lore
Stephen Jackson, an American professional basketball player nicknamed "Captain Jack"
Captain Jack (band), a German Eurodance act
"Captain Jack" (Captain Jack song), a song by Captain Jack from The Mission
"Captain Jack" (Billy Joel song), a song by Billy Joel
Captain Jack (1996 film), a 1996 film written by Scott Wiper
Captain Jack (film), a 1999 film starring Bob Hoskins
Jack Harkness, a central character in the TV series Torchwood (and guest character in Doctor Who)
Captain Jack Harkness, a guest character in Torchwood after whom the regular character was named
"Captain Jack Harkness" (Torchwood episode), an episode of Torchwood in which the guest character appears
Captain Jack Sparrow, the central character in the Pirates of the Caribbean films
Captain Jack Absolute, a character in the 1775 play The Rivals
"Captain Jack", an episode of Leave It to Beaver, and the name of an alligator in that episode
Captain Jack, a character in The Office episode "Booze Cruise"
Captain Jack, a character in the Babylon 5 episode "Racing Mars"
Captain Jack, an alligator in The Simpsons episode "Kill the Alligator and Run"
The Adventures of Captain Jack, a comic book series by Mike Kazaleh published by Fantagraphics 1986–1989
Captain Jack Aubrey, a fictional character in the Aubrey–Maturin novels by Patrick O'Brian